Ring-exchange mechanism for triplet superconductivity in a two-chain Hubbard model: Possible relevance to Bechgaard salts

Y. Ohta; S. Nishimoto; T. Shirakawa; Y. Yamaguchi

doi:10.1103/PhysRevB.72.012503

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Ring-exchange mechanism for triplet superconductivity in a two-chain Hubbard model: Possible relevance to Bechgaard salts

Y. Ohta, S. Nishimoto, T. Shirakawa, Y. Yamaguchi

DOI 10.1103/PhysRevB.72.012503 · Physical Review B

T1

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Abstract

The density-matrix renormalization group method is used to study the ground state of the two-chain zigzag-bond Hubbard model at quarter filling. We show that, with a proper choice of the signs of hopping integrals, the ring-exchange mechanism yields ferromagnetic spin correlations between interchain neighboring sites and produces an attractive interaction between electrons as well as long-range pair correlations in the spin-triplet channel, thereby leading the system to triplet superconductivity. We argue that this mechanism may have possible relevance to the superconductivity observed in Bechgaard salts.

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Formula	Reported Tc (K)	Pressure (GPa)	Type
(TMTSF)2X Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown